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IVisualApi.md

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#Visual class / IVisual

All visuals start with a class that implements the IVisual interface. You can name the class whatever you'd like, but there must be exactly one class that implements the IVisual interface.

Note: your visual class name must match what is defined in your pbiviz.json file.

class MyVisual implements IVisual {
    
    constructor(options: VisualConstructorOptions) {
        //one time setup code goes here (called once)
    }
    
    public update(options: VisualUpdateOptions): void {
        //code to update your visual goes here (called on all view or data changes)
    }

    public enumerateObjectInstances(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstanceEnumeration {
        //returns objects to populate the property pane (called for each object defined in capabilities)
    }
    
    public destroy(): void {
        //one time cleanup code goes here (called once)
    }
}

##Constructor

constructor(options: VisualConstructorOptions)

The constructor of the visual class is called when the visual is instantiated. It can be used for any set up operations needed for your visual.

VisualConstructorOptions

  • element: HTMLElement - a reference to the DOM element that will contain your visual.
  • host: IVisualHost - a collection of properties and services that can be used to interact with the visual host (Power BI). Learn more about IVisualHost

##update

public update(options: VisualUpdateOptions): void

All visuals must implement a public update method. It is called whenever there is a change in the data or host environment.

VisualUpdateOptions

  • viewport: IViewport - the dimensions of the viewport that the visual should be rendered within.
  • dataViews: DataView[] - the dataview object, which contains all data needed to render your visual.
    • your visual will typically use the categorical property under DataView.
  • type: VisualUpdateType - flags that indicate the type(s) of this update. (Data | Resize | ViewMode | Style | ResizeEnd)
  • viewMode: ViewMode - flags that indicate the view mode of the visual. (View | Edit)

##enumerateObjectInstances optional

enumerateObjectInstances(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstanceEnumeration

This method is called for every object listed in capabilities. Using the options (currently just the name) you return a VisualObjectInstanceEnumeration with information about how to display this property.

EnumerateVisualObjectInstancesOptions

  • objectName: string - the name of the object

##destroy optional

public destroy(): void

The destroy function is called when your visual is unloaded and can be used to do clean up tasks such as removing event listeners.

Note: Power BI generally doesn't call this function as it is faster just to remove the entire IFrame that contains the visual.